Write a rule for a function, P
P, that gives the perimeter of a square in inches when the side length is x
x inches.
Let x be the length (in inches) of the side of a square, then the perimeter P(x)\displaystyle P(x)P(x) of the square (in inches) is;
P(x)=x+x+x+x=4x\displaystyle P(x)=x+x+x+x=4xP(x)=x+x+x+x=4x
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